Thermal Conductivity of β-Si3N4: II, Effect of Lattice Oxygen |
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| Authors: | Mikito Kitayama Kiyoshi Hirao Akira Tsuge Koji Watari Motohiro Toriyama Shuzo Kanzaki |
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| Affiliation: | Synergy Ceramics Laboratory, Fine Ceramics Research Association, 2268–1 Shimo-Shidami, Nagoya, Aichi 463–8687, Japan;National Industrial Research Institute of Nagoya (NIRIN), 2268–1 Shimo-Shidami, Nagoya, Aichi 463–8687, Japan |
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| Abstract: | Dense β-Si3N4 with various Y2O3/SiO2 additive ratios were fabricated by hot pressing and subsequent annealing. The thermal conductivity of the sintered bodies increased as the Y2O3/SiO2 ratio increased. The oxygen contents in the β-Si3N4 crystal lattice of these samples were determined using hot-gas extraction and electron spin resonance techniques. A good correlation between the lattice oxygen content and the thermal resistivity was observed. The relationship between the microstructure, grain-boundary phase, lattice oxygen content, and thermal conductivity of β-Si3N4 that was sintered at various Y2O3/SiO2 additive ratios has been clarified. |
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| Keywords: | silicon nitride thermal conductivity additives |
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